Yamaha F4B - Technical Data

1-5
SPEC
Specification
Electrical technical data
Ignition timing control system
(*1) The figures are for reference only.
Charging system (optional for European market)
(*1) The figures are for reference only.
Fuel system technical data
Fuel system
Item Unit
Model
F4BMH F5AMH F6CMH
Spark plug
Cap resistance (*1)
At 20 °C (68 °F) k 5.0
Gap mm (in) 0.6–0.7 (0.024–0.028)
Ignition timing
At 1500 r/min Degree BTDC 7–9
CDI unit
Air gap mm (in) 0.4–0.6 (0.016–0.024)
Item Unit
Model
F4BMH F5AMH F6CMH
Lighting coil
Output peak voltage
At cranking (unloaded) V 20.0
At 1500 r/min (unloaded) V 30.1
At 3500 r/min (unloaded) V 64.3
Resistance (*1)
At 20 °C (68 °F)  0.771–0.869
Rectifier Regulator
Output peak voltage
At 1500 r/min (loaded) V 13.0
At 3500 r/min (loaded) V 13.0
Item Unit
Model
F4BMH F5AMH F6CMH
Fuel joint
Holding pressure
Positive pressure
kPa (kgf/
cm
2
, psi)
50.0 (0.50, 7.3)
Fuel strainer
Holding pressure
Positive pressure
kPa (kgf/
cm
2
, psi)
200.0 (2.00, 29.0)
Primer pump
Holding pressure
Positive pressure
kPa (kgf/
cm
2
, psi)
166.7 (1.667, 24.2)